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United States Patent | 6,198,433 |
Herault ,   et al. | March 6, 2001 |
A multiple-beam electronic scanning antenna including an array of phase-shifters (2, D.sub.ij). The N simultaneous beams are obtained in N directions by a law of excitation (f.sub.ij) applied to each computed phase-shifter (D.sub.ij) by summing the phase laws .psi..sub.1, .psi..sub.2, . . . .psi..sub.k, . . . .psi..sub.N associated respectively with each 1, 2, . . . k, . . . N order direction and by applying the resultant phase-shift (.psi.t.sub.ij) to the phase-shifter, without applying the resultant amplitude modulation (.rho..sub.ij). The multiple-beam electronic scanning antenna especially is applicable to uniquely phase-controlled antennas in satellite or terrestrial communications requiring simultaneous communications with several variable sites.
Inventors: | Herault; Joel (Igny, FR); Soiron; Michel (Chavenay, FR); Garnier; Gerard (Gig sur Yvette, FR) |
Assignee: | Thomson-CSF (Paris, FR) |
Appl. No.: | 296740 |
Filed: | April 23, 1999 |
Apr 24, 1998[FR] | 98 05182 |
Current U.S. Class: | 342/372; 342/157; 342/376 |
Intern'l Class: | H01Q 003/22; H01Q 003/24; H01Q 003/26 |
Field of Search: | 342/372,157,154,158,376 |
4314250 | Feb., 1982 | Hanell et al. | |
4612547 | Sep., 1986 | Itoh | 342/372. |
4980691 | Dec., 1990 | Rigg et al. | 342/372. |
5706012 | Jan., 1998 | Kay | 342/156. |
Y. J. Guo, et al., IEEE Proceedings: Microwaves, Antennas and Propagation, vol. 142, No. 2, pp. 115-120, "Phase Efficiency of the Reflective Array Antenna", Apr. 1, 1995. E. Hecht, pp. 493-494, "Optics", 1987. Shiban K. Koul, Artech House, vol. 1, pp. 47-53, "Microwave and Millimeter Wave Phase Shifters", 1991. Bernard Grob, Mc Graw Hill, pp. 592-593, "Grob Basic Electronics", 1992. R. D. Javor, et al., vol. 2, pp. 956-959, "Beam Steering of Microstrip Flat Reflectarray Antenna", Jun. 19, 1994. |